Walter Isaacson cannot write an alternate ending for Steve Jobs in his famed biography, but the author is entertaining plans to expand the 630-page book in the future.

Isaacson shared his upcoming plans, and numerous anecdotes about the two years he spent with the late Apple CEO, at a Dec.14 event hosted by the Commonwealth Club of California. Fortune senior editor Adam Lashinsky moderated the sold-out discussion.

The biographer mentioned plans to create an annotated version of the best-selling biography.

According to CNN’s Fortune, the author also described Jobs’ influence on the book’s cover at the San Francisco event. The Apple cofounder apparently teased Isaacson about quitting the interviews unless he was given input over the cover:

“It took me about one and a half seconds to say, ‘Sure!’” said Isaacson to the event’s crowd. “I mean this is one of the greatest design eyes of our time.”

Isaacson further discussed writing an addendum to the book that details the days before and after Jobs’ death: